US 12,143,541 B2
Systems and methods for crosstalk reduction for audio communications
Daniel Gish, Carlsbad, CA (US); and Charles Butten, Richmond, CA (US)
Assigned to H.M. Electronics, Inc., Carlsbad, CA (US)
Filed by H.M. Electronics, Inc., Carlsbad, CA (US)
Filed on Aug. 28, 2023, as Appl. No. 18/456,816.
Application 18/456,816 is a continuation of application No. 18/184,849, filed on Mar. 16, 2023, granted, now 11,743,391.
Prior Publication US 2024/0314245 A1, Sep. 19, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04M 1/60 (2006.01); H04M 9/00 (2006.01); H04M 9/08 (2006.01); H04R 3/14 (2006.01); H04S 3/00 (2006.01)
CPC H04M 9/08 (2013.01) [H04R 3/14 (2013.01); H04S 3/008 (2013.01); H04S 2400/01 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multi-channel intercom system configured for crosstalk reduction for audio communications between users, wherein the users include a first user and a second user, the system comprising:
a synchronization component including one or more ports and a clock circuit configured to generate a modulation carrier signal, wherein the one or more ports are configured to provide a communication interface;
a first user station including a first loudspeaker and a first set of ports, wherein the first set of ports is configured to provide a first communication interface; and
a second user station including a second loudspeaker and a second set of ports, wherein the second set of ports is configured to provide a second communication interface, wherein a cable is configured to couple between the first set of ports of the first user station and the second set of ports of the second user station,
wherein the first user station and the second user station are configured to:
(i) use the cable for a first bi-directional audio channel between the first user station and the second user station, and
(ii) use the cable for a second bi-directional audio channel between the first user station and the second user station that is different from the first bi-directional audio channel,
wherein the first user station is further configured to:
(i) receive the modulation carrier signal;
(ii) at a rate based on the modulation carrier signal, invert a first phase of a first audio signal from the first user to generate a phase-flipped audio signal; and
(iii) transfer the phase-flipped audio signal through the cable to the second user station; and
wherein the second user station is further configured to:
(i) receive the phase-flipped audio signal;
(ii) at a second rate based on the modulation carrier signal, invert a phase of the phase-flipped audio signal to generate an intermediate audio signal; and
(iii) present, using the second loudspeaker, a second audio signal based on the intermediate audio signal to the second user.